Patch "scsi: fix host max depth checking for the 'queue_depth' sysfs interface" has been added to the 4.1-stable tree

Patch "scsi: fix host max depth checking for the 'queue_depth' sysfs interface" has been added to the 4.1-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    scsi: fix host max depth checking for the 'queue_depth' sysfs interface

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     scsi-fix-host-max-depth-checking-for-the-queue_depth-sysfs-interface.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 1278dd6809b11dc298e19d81ac0916275f7318c1 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@fb.com>
Date: Mon, 13 Jul 2015 08:24:39 -0600
Subject: scsi: fix host max depth checking for the 'queue_depth' sysfs interface

From: Jens Axboe <axboe@fb.com>

commit 1278dd6809b11dc298e19d81ac0916275f7318c1 upstream.

Commit 1e6f2416044c0 changed the scsi sysfs 'queue_depth' code to
rejects depths higher than the scsi host template setting. But lots
of hosts set this to 1, and update the settings in the scsi host
when the controller/devices probing happens.

This breaks (at least) mpt2sas and mpt3sas runtime setting of queue
depth, returning EINVAL for all settings but '1'. And once it's set to
1, there's no way to go back up.

Fixes: 1e6f2416044c0 "scsi: don't allow setting of queue_depth bigger than can_queue"
Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/scsi/scsi_sysfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -859,7 +859,7 @@ sdev_store_queue_depth(struct device *de
 
 	depth = simple_strtoul(buf, NULL, 0);
 
-	if (depth < 1 || depth > sht->can_queue)
+	if (depth < 1 || depth > sdev->host->can_queue)
 		return -EINVAL;
 
 	retval = sht->change_queue_depth(sdev, depth);


Patches currently in stable-queue which might be from axboe@fb.com are

queue-4.1/bio-integrity-do-not-assume-bio_integrity_pool-exists-if-bioset-exists.patch
queue-4.1/scsi-fix-host-max-depth-checking-for-the-queue_depth-sysfs-interface.patch